Image Resizer
Resize one or many images by exact dimensions or percentage, with optional aspect-ratio lock and a live before/after preview. Batch resize and download everything as a ZIP — all processed locally in your browser, never uploaded.
Click to browse, drop, or paste images
Batch supported — add as many images as you like. Processed locally; never uploaded.
Resize one or many images by exact dimensions or percentage, with optional aspect-ratio lock and a live before/after preview. Batch resize and download everything as a ZIP — all processed locally in your browser, never uploaded. Image Resizer is a free, browser-based tool in the Toolsnest image tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use the Image Resizer
- Open the Image Resizer — no sign-up or software download is required.
- Drag and drop your file(s) into the tool, or click to browse and select them from your device.
- Choose any options you need, such as order, quality, page range or output format.
- Click the action button and let the tool process everything locally in your browser.
- Download the finished file. Your originals are never changed or uploaded.
Why use the Image Resizer?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your files are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full image tools suite, so related image resizer tasks are one click away.
Is it private and secure?
Your privacy is built in. The Image Resizer does all processing on your own device using client-side code, so your files are never transmitted, stored or seen by anyone — including us.
Frequently asked questions
Are my images uploaded to a server?
No. Resizing happens entirely in your browser using the Canvas API — your images never leave your device, which keeps them private and makes the tool instant.
Can I resize many images at once?
Yes. Add as many images as you like; the same settings apply to all of them and you can download the whole batch as a single ZIP.
Will resizing reduce quality?
Shrinking uses high-quality smoothing so results stay crisp. For lossy formats like JPEG or WEBP you can also set the quality; PNG stays lossless.
Does it keep the aspect ratio?
By default yes — enter one dimension and the other is calculated automatically. Turn off ‘Maintain aspect ratio’ to stretch to exact width and height.